Topology (electrical Circuits) - Bridged T and Twin-T Topologies

Bridged T and Twin-T Topologies

Bridged T topology is derived from bridge topology in a way explained in the Zobel network article. There are many derivative topologies also discussed in the same article.

There is also a twin-T topology which has practical applications where it is desirable to have the input and output share a common (ground) terminal. This may be, for instance, because the input and output connections are made with co-axial topology. Connecting together an input and output terminal is not allowable with normal bridge topology and for this reason Twin-T is used where a bridge would otherwise be used for balance or null measurement applications. The topology is also used in the twin-T oscillator as a sine wave generator. The lower part of figure 1.11 shows twin-T topology redrawn to emphasise the connection with bridge topology.